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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ba4280d6429314837e03306f5d79d747ecb02ca121f001f99ca261abf7cf49' 
  AND token = '/LrGtyHByM7WbOKcdaEG7Z2+ZE2O8GlVuQV5SKy8uCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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