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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56b94e84acd02ef82d5ed96cd814a52ce21e3d3e26123e8d05716435ae18c4e' 
  AND token = 'jf+uHVR6Lun7PTyGgXSxHjRHMox1lbqK4FO67+nL/D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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