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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b93e4ea4aa740256273a74ff82da4f87b4cc7d3a0c3c12408dff08e1163751' 
  AND token = 'B7+cDii/gMqOXyb0ZErByJTqXfMlT0/YPhjmY3xR4tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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