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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbd38ab20b3b72ac652f5b45cebd2f9a30b4a0e5f4cfd695ce4639d2b3d3d6f' 
  AND token = 'w/YUhVMbLGIJutOwjiInqOQvwcOy/Q3g9tsbjc5/+Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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