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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed96f8532c9a41a0a5b428b2c5521df7982666b7b091a1584ac518574353cec8' 
  AND token = 'oOs6VmnJqWPrqmLXfiO+/832OtJp5FXCILqZSJUaPp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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