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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b668b51fccddeed4a8ed3a15a600f2541487047a3478e1f1f6a38b073ad411' 
  AND token = 'DzVgyWpNhTKM/5x1DWt+DJhxE440HiiONmOkt3nN0fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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