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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e73212a52fbd6515dcc9f27737a6e70b3217aaa69ff71bff6ce19747b68d21' 
  AND token = '/i9jbVhVD5A9FyoObNpsDuK1B87GKBPjXx7wv9Nd8AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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