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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1fd9566e02496d391745974de10b16b647cd64390c799aedfe596ae528b0dd' 
  AND token = 'qMoHt+si2SPE2tTT6DXJQ24NsRWAB/Sb6KEotlE/Ohw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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