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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b145d029f86244ff64a3eb67af5f5195e8204edea357d4c50c6de69582b6d4d' 
  AND token = 'YAtJEI10qx4I4beaJfPV6tJ7TrqAEpSuRX3w43J7lGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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