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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25998b58d61becd2f3b4b666bd0828dc758ee3edb26cea3c161626b6e1017ede' 
  AND token = 'uC/4Gf6tn3qb1bZ7gpLu7/bG21ZJbgoG8qMAibQQsyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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