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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e302cc86470bd0a99d4be39909f46c0a913b9bdadb842beb4f6d9f1c7192c75' 
  AND token = 'F1KUefkxk7l9lR51MfJ5RAV6mbpVLOqaKNMf0T3wCkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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