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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1fe7984cedd57009aac55c88e4cdaf3bde6ba58e7dff26bc1d15d232f27cf5' 
  AND token = '5hRv9zqehFQ6ap+3ZS4NJuXD1QnMhf7PLLoSrKKvDCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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