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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba9c3de91cdba9b04b73ab409ac131bb95445f5ba7dc8e347e5f6c7f836825c' 
  AND token = 'MZ5Ka3p0smaipgQLsi/mbx/OT/kGz3kyvQa2wR91IuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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