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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda897e865682042788559c4b9fce515e2b09682278ec84e41e1ec1d67e8ab96' 
  AND token = 'svEs86RiGjPkwDM3zRJxIIdTbXQlz0UoanmOAKx4xkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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