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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f99d776b240b09c919b270837ab324e79b9866f41db1d40f762e6ddeef12e8' 
  AND token = 'xNOEY8gF/0yuyO4LwLEJVwvF00kPjgcZ6RO7w965O7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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