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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd789f9fdcb9f8c2efa36589986329c48919714ba54dc362a7c0582a5ce244c4' 
  AND token = 'dL2mp4BWijinoSm557ONnLMm/Le3FYaEuhZalrKj5PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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