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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29afd844c7968b4895dd0ca309fef8ffa5180381a431612e8299987ce053115e' 
  AND token = 'NkwDqrVx/0uSB9OrmXpvvv8oBxD7Y5Q3gTH8GUve+08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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