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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0e5952d62586b83e5445c0be308739866a05b453f6857921374b0002ade5d5' 
  AND token = 'jAV8V2ymAXzQxQGNUD3gLvhB4DQIV5BG8PgxG/gy+no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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