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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5c034c5eeba4d90b7b359efbca89c517f16bbb0ecef43f0dc90c7e9bcfe5a4' 
  AND token = 'mTWDEvpyyePCsR86IFeaTtiZNVz8Fxdzln8feXyyI7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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