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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f9f0b685bcf6b04be9a88738ea473bb0030608958e50c40e4411746f8aecc0' 
  AND token = 'HTxfLIPUrBG/y79oU4Nfi6FFXflzpKdu4Lh/tkZwgto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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