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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4ca3e1febb692bee9b21fb16ba3e533a2fa1afa83b3ea9656e1ca786d5ab2d' 
  AND token = 'KpoPhZoCrJZ9sDziaX5bT1wOStt9UySb20YkVBzEac4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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