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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17dc5c9450a6a45535bb8f9619fb55903c35a942476cc51adafb439c8d9e0f1d' 
  AND token = 'o9IqDNcmwBBCZ7kgGiXy/Zr/yEeyjK4vE3mjgXX8QWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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