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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43a34789c2f0d0f13f56dd631a3b5a58906bdf0c3ef99daf279c89add2bcbe5' 
  AND token = 'kP/rh/m6WBJkoeXayMR39Flfcnek2IuiipY8YnoXG/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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