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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063dc49b65947775fb5b3cb4bcebf7e619e76a43b1ed96051646ad19d55a4463' 
  AND token = '5eLLzDzkRTl1MPeneoFHnJoMV30OaYLd1cX8Ph1vutA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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