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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d687e5e1c62c7ce157e673b8811e85b596b9cd9aae4f5ca2bce635c3c8f8aa2' 
  AND token = 'fDbUDCr55tVQh5w1R7EZEdl3d9ANFRStLTPyho4cPdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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