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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d346ddebfd3c9cc5b2c7b939fe62ec00cf53c1c6a737eae94f2b1e4a5f965e' 
  AND token = '7PbUiAoa5VyOv66A+pE1BXdDQj+sKVVZW7MWlfFVtiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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