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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bdd40f913c8e014127578c91ffefc7e7b4601046b6b30f9898f20ff26e28a1d' 
  AND token = 'YXAVH6X1pSyX7zs2uF6DQOz5IMbdI/+FKfxmjCv3924=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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