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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025f7faca2cda65680ccbe320ea424537c32d8ad62c637aed3be5ff7a869f011' 
  AND token = 'vZtMQ4Kty8/4CAkmfht7mHkC/M8fTXVW3Zgaqp/9Ibc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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