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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854ab04238798995ae5cbcdfec5f1c892b61120af600c9b41af1bdbe10fc0cf3' 
  AND token = 'HXmsh1BXeUtomuHM6XI8/AeOEogbXRRHMv/v7iFibkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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