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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c414aabac607fa0d966837349f9cfbff8565e1c7ee9e326089766770c0e296d9' 
  AND token = 'OH561cW5/qH8xk7X7Fa4FFiWIZRNM+7DqlBQtOYaqHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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