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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8747a7b5b2815d5d68eba43af7f3afe4ac5ad811c6e85c88e97e1a935694600' 
  AND token = 'GQvuycBnnWVGQrGeeClkoxEEqltghGceHCwkTW59Lco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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