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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34ce60c73e66449697d84a1ae2d9c4259c607521e7a10f605e632a35bd09b1e' 
  AND token = 'qDX0K7PumWEm+bErRD1QIYbU3Ll1dQsXmq6W1SV9eKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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