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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4cf5c829a89449c223cfb5721ded50bca876e6a3945cf7020046feec6d574b4' 
  AND token = '5AD552DyRh/Sa7JaomrokNfXi3oICDD6tztvhm/t2kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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