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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf7ef0759310597c0afc1f74dce5aa08da0d8ee5f2e26ddf4e3149a4fc5034a' 
  AND token = '2JQu03ENyOOn20jXVyJSYK35fJ88NlIbUHiNDYOb7BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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