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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a61119e82d4c25923898d347c46c3d4f6a6083e78ecfbc9ae4265f52b7d650' 
  AND token = '1l3wnCIj6u+F7GFtl/YT9a0lO5IEpMqhOLopOuooMbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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