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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2230263fc8d49e478bbb54dc7bfe760f69033d9e1b37598739d3019ebd05a1a8' 
  AND token = 'ssOdTq5k7VRUSbJPUMAtPOsxXBE350mT7cm2pMd17Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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