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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11233eef319bc21bdf3ea5a397a41e399e8fdc1da57256da2bbdd8c26fd4cfa' 
  AND token = 'wf02TC0HY4syG/IxTChwv/kbww+Y2Iys5DpfnNpYjwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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