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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c13b25757725898d774b97e01e388f9faba70959375ec6122c18bc7c261ec9' 
  AND token = 'UPtJgF8+pZ1Fqh0EVyPsEa/YDuBtTf6Vs3oa5DWv+7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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