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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cab99f28cb4de950ecaa0e3e69618876a8f5d16a0db75a3567fc5373dbf64db' 
  AND token = 'zdldoHYXRZSg20e9EWw89M0lS8a3GuLoeFtzCLKH+nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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