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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee951ca4e57885de0e3c92938b5b69054bcfc2baed2a36d97d64c62981bcf6b' 
  AND token = '38Vtf12I6eYjtofCxdqro99qR7OWn6fnGcjv0HjRnBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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