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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7c597ba23fddd7970cdafd2c2e23e43ababce5ae71c0af76bbec8bc6a985d9' 
  AND token = 'bL6PiycrnjPcOIpTNS/yXRm+62OAdO4+CD7Tr1IorS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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