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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17fe692d078b6ea102fb97c6b09d83be17bfd2970974f5e9639630ccba7ea00' 
  AND token = 'YaJPckCACkH0wU1hTUk/hqOXa2IdPji8YjiljpBLN7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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