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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b05a03b1419c08ec7bc9c932ae4b1ddb5617556d618a4d70a308ec4b63060d' 
  AND token = 'qwZ0M/m56muxv0BPJlDj2Mvn69DT6RhNmcM2kzZUFSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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