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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a653e15fbda4c6445a0a8f4e01bda3971d188e7d9031372a979066d84161c3' 
  AND token = 'tQcNqAhAb+IEgjPlqeAVVPN+IfjWZNw52Cie2cRUx58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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