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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01d6d8abdae807319ca04f0a5fc02101519b6a5830f9782af2c80750ddf095dc' 
  AND token = 'UScSUXI9938Cua1vtDDL3+aEfcboGRVHB9kCeM6oiWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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