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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e59ae1eca16add3f7dd50de04ec9bb43f03c1c996b703e348cb458588182c93' 
  AND token = 'SIeVs8kfXfjrVVPoauxORp53SEorhyyEjfI3zf9hzSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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