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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ed0a6a7855bca14845384d20adb9357cdc5bb5500d70ed6a011396cabdee1a' 
  AND token = 'sHhTMJ6GAtNK+fZ5d+HPBwD8ERc5Op+WHgGV5C9j1ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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