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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18003bc4a202778f4b8da62ff029c8654dc777ad9c27ccdaf2a19bf179bf3e1d' 
  AND token = 'af117aVmtuVYG5rFGd27AMu6TXOgyCNr7uv8UarNm0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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