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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb602066f38e7b46dfe8ea6b06a37b2320cb310f8bd8a578176ea5843347d19' 
  AND token = 'Vv4naraS76SIcWmnNKu3LoZcmksX8wpFvDQo9Ogi8Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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