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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a13307c1756342ede8e74610f9fa0f934121772d3b8947dc06c456298b7157d' 
  AND token = 'AOja365uswaYfnQ82QUH1upenZKg8uIbO3B89BKwlLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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