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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9fd698ac93f4d9db6815bd5920e66b5cc57d835b3c104e2fcf8e604d5b6a5e' 
  AND token = 'p/FhiQB4HzfIym9aTPnQBeFAks1nKH92tDHJw20+d3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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