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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4950f1de5bd33faf41885fba88467d35cbe13d97adb8cc9b707e28548fcd0c39' 
  AND token = 'r98Mhu+VXK0NceRuE2D6Cakt/t7Ek5ZVpVohv8Zi6as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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