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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651393af99919cbf3e3b840f96c0c2d602c78b1fca44a2f696891c0fbcb0e6a6' 
  AND token = '87MiuXQcAx1Te78jF5p00cgu5JPIeZ+h9PJY0FnEnMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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