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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f258d29938ab06efa19ea4f0f1785119f982b96bf4508401a5c8cbc4498b73' 
  AND token = 'sDxvhWcw7pXI3G+Z+pBGGv1/3oANJ7Xe15Rov5M099Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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