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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ae42ed09af4386e8d2ae86bd6a68d0f5c6e36872783b975e3be0295e3fa447' 
  AND token = '0Cq2YKr9ZZepGu3JdwHkjuZDO4VZPze5zua2L7aVcVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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