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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d2931b433864cdb6de28800fe93e9d60e43c9e1bad66c256955bc2e01bd573' 
  AND token = '7tH4HDpgFnoCCyo5m0Nhv5ORx1jtleCo7QsBcZ359/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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