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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4beecd55f4cabc112843343dcc4bf454f43ef5d6f4d7347b41d37fd8a6103abd' 
  AND token = 'kDOKkLehyVh/3ouV42XQcKmzs7FocRRmft0Z3yjmKdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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