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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2464dd7b6ba82e4e38c56b13ab92bd6be7b929c6e0719f6ea4b26a4ce3bcc2' 
  AND token = '9QlRvpFgMcwzoMQC0715VN2a6PKUX51lJTuQ4w0hrbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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