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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c385b5b5f2da531090059d1310872d16a998b44bf2a9242a3c468923bb15468d' 
  AND token = 'Xif0yEyWaPYfpjSvXoTKRC5630qHP2uHhlC21XBgCE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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