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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95c0c61643994d74ae0510a16dd5c8dee5bdfe0ec34c6739500ec8f831f8cf8' 
  AND token = '2yOVz+6VtWl3VJbHoleMjniw+8Ga5YaTMYHv6LV5bGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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