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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b73f21ffae4bfd9cb349954663e41adb9355edc7e228c731fd6b78304d9f2a9' 
  AND token = 'LvJXdDRtX0CMOe4RS+mIcPPs/yVv/IHE0wEX3qPOGvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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