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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b69aa0c34f115686c2ee41b49b2ce97151825ccb4e935836ad61ee05a7bb4e' 
  AND token = 'aY38jMKNz3pWQg3hEfWHDMcFiaO42+GDYDF1b3bu31s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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