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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a53db4af3f569dd7d0f9ddde26e4b388d6bd76b9c884e563a80ac83c29f726' 
  AND token = 'i2euhDOzeR4rb8rtaXwQPCMZkZaISpIR5Fda4fD9LII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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