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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba2ff32d42ab7325208e63e23f60b045b3bf3b20f5619dae6ecc40e9fe87d99' 
  AND token = 'oYJKhiRF636tntxDs1MhDQyHk63CV1aIklgpmvUrtIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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