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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2732b532db0ed960295a6bf4330c3112d6af52b16dbb5094dfdd1254c9512ea1' 
  AND token = 'ijBfWsgPOIA39DqrrWDcXjRJj3nc+t0It2u6oNzvpoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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