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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931f09b6c4c27c8413558a8d7ea6af12af1185c34f7d12012771f4e599f2181d' 
  AND token = 'LDyxap+2JaDNP52pb32WohiW3t4o1Hq+FXodiv7+UEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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