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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4bb18ac96a9de7b1720fb9c2d0e156c7477b558f45601cb1ef73d0f2cb7334' 
  AND token = 'KjUllH+hzjhmIx4mnAMuu7U2HPZx74P94ErPAZPNE3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}